What do Group C and D atmospheres encompass?

What will be an ideal response?


Group C contains flammable gas or flammable liquid-produced vapor having either a maximum experimental safe gap value greater than 0.45 mm and less than or equal to 0.75 mm, or a minimum ignition current ratio greater than 0.40 mm and less than or equal to 0.80 mm. Group D contains flammable gas or flammable-produced vapor having either a MESG value greater than 0.75 mm or a minimum current ratio greater than 0.80 mm.

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The abbreviation for the plastic pipe used in systems for water and gas supply lines and irrigation systems is ____________________.

Fill in the blank(s) with the appropriate word(s).

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Theodora and Justinian ruled the Roman Empire from the magnificent city of

a. Rome. b. Lyons. c. Constantinople. d. Alexandria.

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